Add indentation missing from CMake function.  Remove empty lines.
Add indentation missing from CMake function.  Remove empty lines.

cellml/libcellml,hsorby/libcellml,MichaelClerx/libcellml,libcellml/buildbot-testing,MichaelClerx/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,libcellml/buildbot-testing,cellml/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,MichaelClerx/libcellml